Valve bag



March 10, 1942. H. H,CR'AWFORD ET A5 VALVE BAG Filed March 7, 1939 2Sheets-Sheet l IN EN'TOE5 A nzOENEY March 10, 1942. H. H, CRAWFORD ET AL2,275.505

VALVE BAG 2 Sheets-Sheet 2 Filed March 7, 1959 NTCES ATTOENEY PatentedMar. 10, 1942 VALVE BAG Harry 11. Crawford and Morgan Rouse, Wellsburg,Va., assignors, by mesne assignments, to pan. New York, N. Y., a

St. Regls Paper Com York corporation of New Application March 7, 1939,Serial No. 260,320

3 Claims.

This invention relates to valve bags, and particularly to valve bagswhere the inlet opening is securely closed after filling so that therewill be no leakage through the valve.

The primary object of theinvention is to provide a bag which can befilled through a substantially restricted valve opening which isprovided with an inwardly extending valve extension or projectiondesigned to close the valve and substantially prevent leakage of the bagcontents from the bag through the valve opening- Another object of theinvention is to provide means for rendering the bag valve substantiallyleakproof which are applicable to either single wall bags or multi-wallbags, and which may be used in association with bags whose end closureflaps are maintained closed by either pasting, sewing or stapling.

Another object of the invention is to provide means of the characterreferred to which are disposed entirely within the valve opening.

An understanding of the construction and function of the subject matterof the instant invention will be secured after a study of the followingspecification and the accompanying drawings, in which Figure 1 is afragmentary perspective view of the valve end of a filled pasted paperbag formed in accordance with the present invention;

Figure 2 is a similar view of a pasted bag with the end closure flapsopen and showing the area of the valve flap adapted to receive theadhesive for attaching; the valve extension thereto;

Figure 3 is a view similar to that depicted in Fig. 2 showing theextension attached to the valve; v

Figure 4 is a vertical sectional view -of the valve construction shownin Fig. 3, a filling tube being shown in dotted lines;

Figure 5 is a view similar to that depicted in Fig. 3 illustrating amodified form. of valve extension;

Figure 6 is a view similar to that depicted in Fig. 3 illustratinganother form of valve extension;

Figure 7 is a side elevation of a bag having the end closure flaps sewedtogether, parts being broken away and shown in section so as toillustrate the invention as applied to a sewed bag; and

Figure 8 is a perspective and fragmentary view of the valve end of asewed or stapled paper bag with the end closure flaps open.

Referring particularly to Figures 1 to 4, in-

elusive, of the drawings, the reference numeral l designates a paper bagof single wall construction and having ordinary forms of end flapsfolded so as to form the so-called "diamond fold," wherein the angularlyshaped opposite ends of the bag end flaps combine with the triangularlyshaped outer end of the valve flap to form a diamond shape when the bagis empty and collapsed.

In the formation of the valve construction illustrated in the specificfigures of the drawings referred to, the opposite bag walls are spreadapart to form end closure flaps 5 and I0 and the opposite edges arefolded inwardly to form flaps 3 and 4, the flap 3 of the drawings beingdesigned to serve as a valve flap. The end closure flap 5 has atriangular portion ll formed from an integral extension of the valveflap 3, while the end closure flap III has a triangular portion I3formed from an integral extension of the valve flap 5 the triangularportions H and I3 being formed in an obvious manner when the valve flap3 is formed by folding inwardly.

The outer edge of a rectangularly shaped strip of paper or othersuitable material M, which may be cut from a continuous roll of suchmaterial, is positioned on the inner edge of the valve flap 3 andpermanently retained in position by adhesive covering the area l5 shownin Fig. 2. As shown in the drawings, the strip l4 projects interiorly ofthe bag. As shown in Fig. 3, onejend of the strip of paper It formingthe valve projection may extend laterally a distance so that it willextend outwardly equal to the full width of one of the end closureflaps, while its opposite end will extend only fractionally of the widthof the other end closure flap.

The bag end is closed by folding down the end flap 5 and then foldingdown the end flap l0 upon flap 5 in the usual manner, adhesive ll beingborne by the inner surface of the'flap ID,

as shown in Figure 3, to permanently maintain the meeting surfaces ofthe flaps 5 and Hi together.

It will be observed that when the end closure flap 5 is folded down tobag end closing position, the end of the valve extension M will befolded down upon the main portion of the paper strip. When thecomplemental end closure flap I0 is folded down upon the end flap 5 tocomplete the end closure, the opposite end of the valve extension stripwill likewise be folded and be disposed intermediate the two end flaps 5and I0. Thus, the strip ll when so folded forms a tubular extension forthe valve flap 3, the extension projecting interiorly of the bag andbeing entirely confined within the valve opening.

when it is desired to fill the. bag, the end of the feed pipe l8attached to the filling apparatus is inserted in the valve so that itextends over the valve flap 3 and is encircled and substan- I9, or othersuitable material, whose opposite ends do not extend over the endclosure flaps 5 and ID. This flat strip l9, like the extension l4,projects interiorly of the bag, and, because of its flexibility, adaptsitself to the function of resisting any movement of the contentsoutwardly of the bagv through the valve.

The modification depicted in Fig. 6 reveals a valve extension stripwhose opposite ends extend partially over the end closure flaps, 5 andi0. Such a construction also serves to efiectively prevent leakage 'ofcontents through the valve.

The bag 30 revealed in Figures 7 and 8 has its ends closed by threadstitching rather than by adhesive. The bag is devoidof folded'end flapsand, instead, the opposite side walls are brought into side-by-side,substantially parallel relation and stitched or stapled together foreffecting the closure. A longitudinally extending gusset 32 is formed ineach edge of the bag and the inwardly directed valve flap 33 is formedby expanding or spreading the gusset 32 at one end of the bag blank ortube and folding inwardly the expanded end of the gusset to form a valveflap 33.

The valve extension 34 is attached to the valve flap 33 as described inassociation with Figure 3 of the drawings except that each of theopposite ends of the extension 34 preferably extend substantially to theend of the bag so that the ends of the valve extension will be engagedand sewed or stapled, as by the stitching 3|. The

function of the valve extension in the sewed or stapled bag is the sameas 'in the pasted bag.

While the bag herein shown and described consists of a single wall ofsingle ply paper, it will be understood that the invention is equallyapplicable to bags of multi-wall construction wherein two, three or morepiles of paper are used. I

Moreover, it may be pointed out that the, valve extension may be appliedto other types of valves other than those herein specifically referredto.

Although we have illustrated and described preferred embodiments of theinvention, it will be apparent that various changes and alterationsmight be made in the general form and arrangements of elements describedwithout departing from the invention. Hence, it is not desired to belimited to the precise details set forth, and we shall considerourselves at liberty to make such changes and alterations as fairly fallwithin the spirit and scope of the appended claims.

What is claimed is:

1. A bag of the character referred to having a valve flap and havingoppositely disposed end closure flaps formed from the side walls of thebag, a strip of material attached to said valve flap and projectinginteriorly of the bag to form a valve extension, said stripoif materialextending entirely across the width of one of the end closure flaps andonly partially across the width of the opposite end closure fiap, saidstrip being folded into sleeve form and the end closure flaps beingfolded one upon the other and adhere'l together to close the bag end.

2. A bag of the character referred to having a valve flap and havingoppositely disposed end closure fiaps formed from the side walls of thebags. strip of material attached to said valve fiap and projectinginteriorly of the bag to form a valve extension, said strip of materialextending entirely across the width of one of the end closure flaps andextending across the opposite end closure flap a distance less thanone-half the width of the latter flap, said strip being folded intosleeve form and the end closure flaps being folded one upon the otherand adhered together to close the bag ends.

3. A bag of the character referred to having a valve flap and havingoppositely disposed end closure flaps formed from the side walls of thebag, one of which flaps is provided with paste on its inner surface, astrip of material attached to the valve flap and projecting interiorlyof the bag to form a valve extension, said strip of material extendingentirely across thewidth of the non-pasted end closure flap andpartially across the opposite pasted end closure flap, said strip beingfolded into sleeve form and the end closure flaps being folded one uponthe other so as to position the paste between the two end closure flaps.

HARRY H. CRAWFORD. MORGAN ROUSE.

